ATLANTA -- Zoo Atlanta is one of many zoos worldwide participating in Orangutan Caring Week, which began Nov. 11.

The Grant Park zoo held a special demonstration at its orangutan habitat on Sunday and will host another one on Saturday, Nov. 17.

Activities include a zookeeper Q&A session at 11 a.m. and a feeding at 2:15 p.m. Special feedings will also be held throughout Orangutan Caring Week.

According to Zoo Atlanta spokeswoman Keisha Hines, Atlanta's zoo has the largest zoological collection of orangutans in the U.S. The zoo's 13 orangutans range in age from 2 to 42; one of them, 16-year-old Blaze, is due to give birth in January.

Zoo Atlanta is located at 800 Cherokee Avenue SE. Learn more at zooatlanta.org.

ATLANTA -- Atlanta's zoo is giving visitors the chance to guess how much its biggest snake weighs before her annual weigh-in.

The female reticulated python is the largest resident of Zoo Atlanta's World of Reptiles. Zoo staff members weigh and measure her once a year. But Tuesday marks the first time in years that zoo guests have been invited to watch.

Reticulated pythons are native to Southeast Asia and are the world's longest snake species. They are non-venomous constrictors. They ambush their prey, including mammals as big as pigs.

The measurements will be taken at 2:30 p.m. by members of the zoo's herpetology department.

ATLANTA -- Just three weeks after losing one beloved gorilla, Atlanta's zoo is mourning the death of a second geriatric ape.

Zoo Atlanta says Ivan never regained consciousness after being put under general anesthesia Monday for a diagnostic assessment. The zoo says the 50-year-old ape had recently lost weight, seemed to lack appetite and had a respiratory illness.

Late last month, the zoo euthanized a fellow western lowland gorilla named Joe. The 49 year old had suffered a decline in health and host of chronic problems, including heart disease.

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Ivan had lived at Zoo Atlanta since 1994.